TOPIC:

I am having some trouble with my rear wheel. I bought a set of Gpz750UT wheels, and the dimensions doesn't line up at all with the rear wheel...

I made a very simple drawing about my problems. If you guys are able to help me i would be very happy. If I am correct i would need to mod more than just one bearing, to make the gpz wheel fit. Any ideas, or have i misunderstood something here maybe?

No i am having some trouble with the rear wheel, so i thought i should fix that before I do the front wheel.

For your 20 mm wheel/swing arm axle conversion you need a 6204 2RS bearing for your GPZ 750 wheel.

www.kugellager-express.de/rillenkugellager-6204-2rs-20x47x14-mm

Based on your drawings, you will also need to remove 4mm from the spacers. Whether that comes off equally from both sides or all from one side or some combination depends on how the front and rear sprockets line up. Some folks will say that the rear wheel must be perfectly centered in the frame, but the ZRX1200 and several Harley Davidson models come from the factory with offset rear wheels, and nobody whines about them.

Step by step TexasKZ, he had to solve this first. We all are 24/7 here to answer his next question.

Well, ok.

I am genuienly grateful for your help. I spended hours in the garage trying to figure out how to solve the problem with those four millimeters.

So, just to clear my mind here. I would need two new wheel bearings (47x20x14mm) combined with some modification on the spacer? Could i just machine the socket that sits between The bearings on the gpz? That is still only 16mm as the original bearings, and if I am correct that would be an issue as well. Right?

Thank you for your help every one, especially a big Thanks to Scirocco!

Leave the inner spacer (socket) between the new wheel bearings untouched!!!
The inner spacer will keep the ID races of the new (old) bearings in place as same as the outer L/R spacer that maybe need to modify to fit the swing arm opening (maybe).
Do you want to use the Z1000J rear sproket carrier on the GPZ750 wheel, did it fit in the damping Rubbers?

But i cant see how that would be possible, since the diameter on the spacer (that sits between the bearings) is 16mm. And I cant use the spacer from the z1000j, since that spacer is 4mm shorter than the one from gpz.
Or am i missing something here?

I thought to use the chain sprocket from z1000j, The Rubber fitted well, However it seems not to be possible either, since it differs 3 mm on how deep the chain sprocket goes between original and gpz.

Sorry if i am getting everything wrong or doesn't understand correctly.

The problem is you used a 750cc rear wheel. If you study the Kawasaki parts diagrams and compare bearing and axle sizes youd see they went with a larger axle on 900cc+ bikes. I think the swingarm pivot is smaller on 750 and smaller bikes too.

To use that wheel you can probably use the 750 axle and machine T shaped bushings to make up the space in the axle adjusters

Check the chain sizes too.

Thats my own thoughts as well. The problem is that i bought a wheel set from 750 from the beginning, and I belive it will be more easier to just buy a wheel from a 900 or a 1100 directly.

Yes.

In the parts diagrams Kawasaki lists hardware sizes and alot of times bearing numbers. Take those bearing numbers and look up the dimensions, then compare withe the donor bike.

Good luck!